The first, second and fourth terms of a proportion are 45, 63, 35 respectively. Find the third term.
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a1= 45,a2 = 63,A4 = 35
a+d = 63,a= 63 - d
a +3d = 63-d +3d = 63 + 2d = 35 so 2d = 35 -63 further solve nd find value of a nd d ..then find third term...that is a +2d in it put the value of a nd d
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